Question

9．口算
12×1$\frac{2}{3}$=
$\frac{1}{5}$÷$\frac{2}{3}$=
18÷$\frac{9}{20}$=
$\frac{4}{5}$×12×$\frac{2}{3}$=
$\frac{3}{20}$×$\frac{4}{9}$=
$\frac{4}{15}$×$\frac{15}{16}$=
$\frac{5}{6}$÷10=
$\frac{3}{4}$×$\frac{4}{3}$÷12=

Answer 1

分析 根據(jù)分?jǐn)?shù)乘除法運(yùn)算的計(jì)算法則計(jì)算即可求解．注意先約分再計(jì)算．

解答 解：12×1$\frac{2}{3}$=20
$\frac{1}{5}$÷$\frac{2}{3}$=$\frac{3}{10}$
18÷$\frac{9}{20}$=40
$\frac{4}{5}$×12×$\frac{2}{3}$=$\frac{32}{5}$
$\frac{3}{20}$×$\frac{4}{9}$=$\frac{1}{15}$
$\frac{4}{15}$×$\frac{15}{16}$=$\frac{1}{4}$
$\frac{5}{6}$÷10=$\frac{1}{12}$
$\frac{3}{4}$×$\frac{4}{3}$÷12=$\frac{1}{12}$

點(diǎn)評(píng) 考查了分?jǐn)?shù)乘除法運(yùn)算，關(guān)鍵是熟練掌握計(jì)算法則正確進(jìn)行計(jì)算．